: The concerted action persons have collectively reduced their holdings by 0.40%.

Joint Test Technology announcement, the actual controller of the company's concerted action persons Li Hui and Zhang Hui, from November 4, 2025 to November 13, 2025, through centralized bidding and block trading, accumulated a total of 258,200 shares in the company, accounting for 0.40% of the total share capital of the company. After this equity change, the proportion of company shares held by the actual controller and its concerted action persons decreased from 34.40% to 34.00%.